Remove explicit `api_token` parameter from individual endpoints

[jogold]

The spec defines a global security scheme EODHDQueryKey (type apiKey, in query) and applies it at the top level:

security:                                                                                                 
  - EODHDQueryKey: [] 

However, every endpoint also declares api_token as an explicit required query parameter. This is redundant and causes issues with OpenAPI code generators: the generated SDK functions require callers to pass api_token manually on every call, defeating the purpose of centralized auth configuration.

The global security scheme alone is sufficient to describe the authentication mechanism. Removing the per-endpoint api_token parameter would:

• Eliminate the duplication
• Allow generated clients to handle auth transparently via a single configuration point
• Better follow OpenAPI best practices for API key authentication